Improvement in grate-bars



@anni (affine HOSEA BALL,OF

Letters Patent No. 109,711

NEW'YORK,N.Y

, dated November 29, 1870.

IMPROVEMENT IN GRATE-BARS.

The Bchdule referred to in these Letters Patent and making part of thename.

To all whom it may concern:

Be it known that I, Hosea BALL, of the city, county, and State of NewYork, have invented a new and improved Grate-Bar, of which the followingis a specification.

Nature mul Objects of the Invention.

My grate-bars are pivot'ed and connected to adapt them to receive asimultaneous oscillating motion.

Each bar is provided at its upper part with a number of transverse hars,having convex upper surfaces, to support the fuel, and are well adaptedto discharge ashes when the bars are rocked.

Description of the Accompanying Drawing.

Figure lis a plan o1' top view of a grate composed of my improved bars.

Figure 2 is a transverse vert-ical section on the line a b, tig. 1.

liignre 3 is a longitudinal' section on the line c d, fig. l.

General Description.

In the drawing- A A represent the walls of the furnace, and

B, the primary grate-bars, which rock upon pivots or bearers C.

lhese bearers may be attached to the ends of the bars B, and rest iusockets in the sides of the furnace, or, as shown in the drawing, studsmay project from the sides of the furnace, and enter sockets in the endsof the bars.

I prefer that-the center of oscillation of the bar shall be upon thechord ofthe arc formed by the upper surface of each of the removableupper bars D D, which tit transversely upon the main bars 13,' and con-1 stitutev the furnace bottom, or the grated floor of the lfuel-chamber.

Fig. 2 shows the relation as to the center of oscillation.

lhe bars B may be of the form shown in the iigure, with one obliqueside, slant-ing down to a lower corner, where the rocking-rod E isattached, or the bar lmay` be rectangular, 'and have adown\vardly-extending arm, to which the said rod is connected.

rlhe floor of the furnace consists of several ranges of lthese upperhars D D, those ofeach range vbeing attached to their respective bars B,and moving therewith.

'lhe segment-shaped blocks B', at each end of the range of upper barsare not so much exposed to heat, and are cast with the bar B, while theupper bars D are removable.

I am aware that rocking grate-bars have before been made with lateralprojections, but a great advantage results from theconstruction of mysegmental transverse bars D, their convex upper surfaces having a bettereffect on the fuel, and adapting them to discharge the ashes more freelywhen the bars are rocked.

Claim.

I claim as my invention- The rocking grate-bars B, each provided at topwith a number of transverse bars, D, constructed with convex uppersurfaces eccentric to the pivots C, the whole being adapted to operatesubstantially as described.

To'the above specitication of my invention I have signed my hand this31st day of August', A. D. 1868.

Witnesses: HOSEA BALL.

EDWARD H. KNIGHT, WM. H. BRERETON.

